Chapter 4 - Add paragraph about suggested working directory and file storage location.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@2892 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter04/chapter04.xml

@@ -29,6 +29,13 @@ unsuccessful with this you should consult the book's errata page at
 the alternative means of download listed at 
 <ulink url="http://linuxfromscratch.org/lfs/packages.html"/></para>
 
+<para>You'll need to store all the downloaded packages and patches somewhere
+that is conveniently available throughout the entire build. You'll also need a
+working directory in which to unpack the sources and build them. A scheme that
+works well is to use $LFS/tools/src/packages for all the downloaded files and
+$LFS/tools/src for the working directory. In this way, everything will be on the
+LFS partition and always available.</para>
+
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